When building dvd+rw-tools on an "unstable" Gentoo GNU/Linux system with
Linux headers derived from a 2.6.23 kernel, there are compilation errors
due to INT_MAX being undefined. This can be fixed by adding '#include
<limits.h>' to growisofs.c and transport.hxx, at least in the
GNU/Linux-specific parts of those files.

The definitions of the CDSL_CURRENT and CDSL_NONE macros changed in the
2.6.23 kernel sources <linux/cdrom.h>. They are now defined in terms of
INT_MAX, whereas previously they were based on casting an unsigned
integer constant numerically equal to INT_MAX.